Can closure



July 5, 1932. H 5 ET AL 1,866,468

CAN CLOSURE Filed Feb. 4, 1930 ATTORNEY Patented july 5, 1932 t? E T E morator.

LEONARD HIRSGH, OF LYNDHURST, AN D EDWIN A. HARRISS, OF ORANGE, NEWJERSEY, ASSIGNORS T R. B. DAVIS COMPANY, OF HOBOKEN, NEVI JERSEY, ACORIPORATION 0F NEW JERSEY GAN CLOSURE Application filed. February 4,1930. Serial No. 425,747.

which we have shown a selected embodiment of the invention and in whichFig. 1 is a view partly in elevation and partly in section showing thetop of a can having the novel closure applied thereto.

Fig. 2 is a section on the same plane as the sectional part of Fig. 1,showing a portion of the closure on an enlarged scale, before attachmentto the can.

Figs. 3, 4, 5, 6, 7, 8 and 9 are views showing successive stepsperformed on a blank to transform it into the closure.

Referring first to Fig. 1, we have shown the invention as used inconnection with a can 1 having a top designated generally at 2, andwhich is secured to the can at 3 by any suitable means such as a doubleseam. This top forms a closure for the can and is preferably providedwith a central recess 4 adapted to receive the plug 5.

In the bottom of the recess is disposed a frangible sealing member 6which may be v made of any suitable material which can be easily cutwith a knife, preferably without leaving a ragged edge. This'materialmay be paper, cardboard, cellophane, thin aluminum, or the like, itbeing understood that the top is of sheet metal or relativelynon-frangible material.

Referring now to Figs. 3 to 9 inclusive, in Fig. 3 is shown a blank withwhich the method of forming the closure may start... this blank being inthe form of a cup-shaped member having a flat bottom 7 surrounded by a.cylindrical wall 8, this bottom and wall defining a recess. By the neXtoperation, the bottom is depressed, as shown in Fig. 4-, and thecylindrical wall 8 is made of smaller diameter, a flange 9 being formedat the same time. The cylindrical wall is shown as extending in avertical direction, and in the claims it will be referred to asvertically extending, this being done for the sake of convenience indefining relative parts of the structure, and not for the purpose oflimiting the invention.

By the next step, the flange is formed with a gutter 10, as shown inFig. "5, and by-the following step the bottom 7 is brought to the.

position shown in Fig. 6, the wall 8 being folded back on itself to forman edge 11 in the shape of a fold, it being noted that this edge isdisplaced from the bottom in a direction lengthwise of the wall 8. i

-The bottom 7 is then provided with an opening with its edge 12 foldeddownwardly as seen in Fig. 7, and by the next step this edge is foldedtoward the Wall to form the head 13. The sealing member 14 is thenplaced against the bead and. the folded edge 1.1 is bent inwardly at thesame time that the bead 13 is bent downwardly and outwardly toward thefolded edge 11, to the position shown in Fig. 9. The result is aone-piece can top having an opening therein closed by a sealing membersecured to the top adjacent the opening by a permanent mechanical air--tight joint. This combination is claimed more broadly in our copendingapplication, Serial No. 351,068, the present application claiming adetailed change in the construction disclosed and claimed in saidcopending application.

It will. be seen that the bead 13, as well as the folded edge 11, extendtransversely to the plane of the sealing member, and that the sealingmember is received within the space between these two elements, beingbent twice in reverse directions, first around the head 13 and thenaround the folded edge 11. arrangement the sealing member is clampedbetween two smooth elements overlapping one another, and while theseelements lock the bent edge portion of the sealing member between them,nevertheless there is no ragged out edge of metal to contact with thesealing member. Moreover, the construction is one which may be easilymade by suitable dies, without the dies at any time coming in contactwith the sealing member which is protected at all times from the dies.At the same time, when the frangible sealing mem- By this posed roughedge which might cause damage to the hands of a person'opening the can.

The joint between the sealing member and the top may be made stilltighter by placing a suitable sealing compound in thespace between thebead and-the folded edge, or by using a sealing member which is coatedwith paraffin, or the like, which will be heated during the sealing stepand thus flow into the spaces between these two elements. In any case,automatic sealing machinery may be used in practicing the invention.

While we have shown the invention as applied to the top, it is to beunderstood that, if

desired, it may be applied also to the plug, in which case of course thecontents will be permanently exposed or some other temporary closureprovided therefor.

We claim 1. A can closure having a recess surrounded by a verticallyextending wall of sheet material, said wall having its lower edge turnedinwardly to constitute a wall edge portion and said recess having abottom spaced along the wall from said turned in lower edge of the wall,said bottom having an opening therein, said bottom adjacent the openingbeing folded back to constitute a folded edge p0rtion, and a sealingmember extending across said opening and engaging the lower surface ofsaid folded edge portion of the bottom,

said turned in wall edge portion engaging said sealing member andholding it against said folded edge portion of the bottom.

2. A can closure having a recess surrounded by-a vertically extendingwall of sheet material, the lower edge of said wall being in the form ofa fold turned inwardly, one layer of said fold being disposed inwardlyof the other and terminating in an inwardly extending portionconstituting the bottom of said recess, said bottom having an openingtherein, said bottom adjacent the opening being folded back and turneddownwardly to constitute a folded edge portion, and a sealing memberextending across said opening and engaging the outer surface of saidfolded edge portion of the bottom, said turned in fold at the lower edgeof said wall being disposed between said wall and said folded edgeportion and engaging said sealing member and holding it against saidfolded edge portion of the bottom.

LEONARD HIRSCH. EDWIN A. HARRISS.

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